"in case"後面可以跟一箇完整的句子,這個句子表示將來可能發生的動作,例如:"I don’t let him climb trees in case he tears his trousers."(我不讓他爬樹,以免撕破褲子)。此外,"in case"也可以引導目的狀語從句,表示“以免,以備,以防”等意思,例如:"I've bought a chicken in case your mother stays to lunch."(我買來一隻童子雞,以備你媽媽留下喫午飯)。需要注意的是,"in case of"和"in the case of"的用法與"in case"不同,"in case of"後面跟的是名詞性質的詞,"in the case of"則用來轉而提及另一件事情。